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                <p>公司使用spring cloud微服务，网关使用的是spring gateway，配合nacos注册中心</p>
<p>日常开发测试有个需求，就是自己本地起微服务，不管是通过前端页面点击调试，还是工具如postman发送api请求，都希望自己本地IP发起的请求，都转发到自己本地的微服务上，gateway无论是开发环境还是测试环境都是共用的，另外有一整套配套的开发环境或者测试环境的微服务，这样本地就不需要额外起gateway和对应的和自己这次开发无关的微服务了。</p>
<p>我其实对spring gateway的源码也不熟，之前调试过一次gateway内存泄漏，是官方的bug，堆外内存的count忘记释放了，导致gateway每过一段时间就停止服务，原因是堆外内存的count达到最大值，这是另外一个话题了，现在就想重写lb的策略，通过自己自定义的策略来实现上述需求。</p>
<p>我们熟悉代码最快的方法是什么？我觉得是debug，那就先本地debug启动gateway，然后打上断点，来通过debug调试熟悉整个请求转发以及lb的策略是什么样的。</p>
<p>首先我知道gateway一定会走LoadBalancerClientFilter，别问我怎么知道的，要问就是随便在spring-cloud-gateway-core的源码里根据类名猜的，这个基类只有2个方法</p>
<pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token keyword">public</span> <span class="token class-name">Mono</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">Void</span><span class="token punctuation">></span></span> <span class="token function">filter</span><span class="token punctuation">(</span><span class="token class-name">ServerWebExchange</span> exchange<span class="token punctuation">,</span> <span class="token class-name">GatewayFilterChain</span> chain<span class="token punctuation">)</span><span aria-hidden="true" class="line-numbers-rows"><span></span></span></code></pre>

<pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token keyword">protected</span> <span class="token class-name">ServiceInstance</span> <span class="token function">choose</span><span class="token punctuation">(</span><span class="token class-name">ServerWebExchange</span> exchange<span class="token punctuation">)</span>
<span aria-hidden="true" class="line-numbers-rows"><span></span></span></code></pre>

<p>都打上断点瞅一瞅</p>
<p>通过Paw给本地的gateway发请求       <img src="https://p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/2a0e03c57394408a94780cccd33010fc~tplv-k3u1fbpfcp-zoom-1.image"></p>
<p><img src="https://p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/ba9abdaec5eb4649bbeee78e842ffe26~tplv-k3u1fbpfcp-zoom-1.image"></p>
<p><img src="https://p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/3cca186a8aaa474aaebf80f9bf404df0~tplv-k3u1fbpfcp-zoom-1.image"></p>
<p>这个里面和这次需求有关的代码为：</p>
<pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token keyword">if</span> <span class="token punctuation">(</span>url <span class="token operator">!=</span> <span class="token keyword">null</span> <span class="token operator">&amp;&amp;</span> <span class="token punctuation">(</span><span class="token string">"lb"</span><span class="token punctuation">.</span><span class="token function">equals</span><span class="token punctuation">(</span>url<span class="token punctuation">.</span><span class="token function">getScheme</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token operator">||</span> <span class="token string">"lb"</span><span class="token punctuation">.</span><span class="token function">equals</span><span class="token punctuation">(</span>schemePrefix<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span aria-hidden="true" class="line-numbers-rows"><span></span></span></code></pre>

<p>这块判断因为反编译所以是写死的lb字符串，以spring的技术规范，源码应该不至于写成这样。</p>
<p>只有配置成lb协议的才会走choose方法,而根据choose的返回值可以猜出来这个方法的作用就是选取一个服务提供者。</p>
<pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token keyword">protected</span> <span class="token class-name">ServiceInstance</span> <span class="token function">choose</span><span class="token punctuation">(</span><span class="token class-name">ServerWebExchange</span> exchange<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
        <span class="token keyword">return</span> <span class="token keyword">this</span><span class="token punctuation">.</span>loadBalancer<span class="token punctuation">.</span><span class="token function">choose</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token punctuation">(</span>URI<span class="token punctuation">)</span>exchange<span class="token punctuation">.</span><span class="token function">getAttribute</span><span class="token punctuation">(</span><span class="token class-name">ServerWebExchangeUtils</span><span class="token punctuation">.</span>GATEWAY_REQUEST_URL_ATTR<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">getHost</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token punctuation">&#125;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span></span></code></pre>

<p>而choose的方法实现调用了loadBalancer的choose方法。</p>
<p><img src="https://p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/1f1fb17446624951aed2e882c2aa0bcf~tplv-k3u1fbpfcp-zoom-1.image"></p>
<p>而实现了choose接口方法的实现类有哪些呢？<img src="https://p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/3ef9ac25d2e64da99bd4291e4d1290aa~tplv-k3u1fbpfcp-zoom-1.image"></p>
<p>我目前也不知道会走哪个实现类，都打上断点看看会到哪个实现类里</p>
<p><img src="https://p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/2fd65caddee6475d8bec23e0da22a0d2~tplv-k3u1fbpfcp-zoom-1.image"></p>
<p>可以看到走的是RibbonLoadBalancerClient这个实现类。方法实现又转给了自己的choose方法</p>
<pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token keyword">public</span> <span class="token class-name">ServiceInstance</span> <span class="token function">choose</span><span class="token punctuation">(</span><span class="token class-name">String</span> serviceId<span class="token punctuation">,</span> <span class="token class-name">Object</span> hint<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
        <span class="token class-name">Server</span> server <span class="token operator">=</span> <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">getServer</span><span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">getLoadBalancer</span><span class="token punctuation">(</span>serviceId<span class="token punctuation">)</span><span class="token punctuation">,</span> hint<span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token keyword">return</span> server <span class="token operator">==</span> <span class="token keyword">null</span> <span class="token operator">?</span> <span class="token keyword">null</span> <span class="token operator">:</span> <span class="token keyword">new</span> <span class="token class-name">RibbonLoadBalancerClient<span class="token punctuation">.</span>RibbonServer</span><span class="token punctuation">(</span>serviceId<span class="token punctuation">,</span> server<span class="token punctuation">,</span> <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">isSecure</span><span class="token punctuation">(</span>server<span class="token punctuation">,</span> serviceId<span class="token punctuation">)</span><span class="token punctuation">,</span> <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">serverIntrospector</span><span class="token punctuation">(</span>serviceId<span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">getMetadata</span><span class="token punctuation">(</span>server<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token punctuation">&#125;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span></span></code></pre>

<pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token keyword">protected</span> <span class="token class-name">ILoadBalancer</span> <span class="token function">getLoadBalancer</span><span class="token punctuation">(</span><span class="token class-name">String</span> serviceId<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
        <span class="token keyword">return</span> <span class="token keyword">this</span><span class="token punctuation">.</span>clientFactory<span class="token punctuation">.</span><span class="token function">getLoadBalancer</span><span class="token punctuation">(</span>serviceId<span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token punctuation">&#125;</span>
<span class="token keyword">protected</span> <span class="token class-name">Server</span> <span class="token function">getServer</span><span class="token punctuation">(</span><span class="token class-name">ILoadBalancer</span> loadBalancer<span class="token punctuation">,</span> <span class="token class-name">Object</span> hint<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
        <span class="token keyword">return</span> loadBalancer <span class="token operator">==</span> <span class="token keyword">null</span> <span class="token operator">?</span> <span class="token keyword">null</span> <span class="token operator">:</span> loadBalancer<span class="token punctuation">.</span><span class="token function">chooseServer</span><span class="token punctuation">(</span>hint <span class="token operator">!=</span> <span class="token keyword">null</span> <span class="token operator">?</span> hint <span class="token operator">:</span> <span class="token string">"default"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token punctuation">&#125;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>

<p>通过抽象工厂拿到对应的loadBalancer，并调用其chooseServer方法</p>
<p>真实的loadBalancer是谁呢？是ZoneAwareLoadBalancer继承DynamicServerListLoadBalancer，这个loadBalancer为什么是ZoneAwareLoadBalancer，可以配置么？我目前还不知道。先忽略工厂策略，继续往下走。</p>
<p><img src="https://p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/ba652788c4d7494eb58997944cefe349~tplv-k3u1fbpfcp-zoom-1.image"></p>
<p>这个ZoneAwareLoadBalancer玩了个寂寞，因为我只有一个Zone所以直接调用父类BaseLoadBalancer的chooseServer方法，并传了个default的key。</p>
<pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token keyword">public</span> <span class="token class-name">Server</span> <span class="token function">chooseServer</span><span class="token punctuation">(</span><span class="token class-name">Object</span> key<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
        <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">.</span>counter <span class="token operator">==</span> <span class="token keyword">null</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
            <span class="token keyword">this</span><span class="token punctuation">.</span>counter <span class="token operator">=</span> <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">createCounter</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token punctuation">&#125;</span>

        <span class="token keyword">this</span><span class="token punctuation">.</span>counter<span class="token punctuation">.</span><span class="token function">increment</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">.</span>rule <span class="token operator">==</span> <span class="token keyword">null</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
            <span class="token keyword">return</span> <span class="token keyword">null</span><span class="token punctuation">;</span>
        <span class="token punctuation">&#125;</span> <span class="token keyword">else</span> <span class="token punctuation">&#123;</span>
            <span class="token keyword">try</span> <span class="token punctuation">&#123;</span>
                <span class="token keyword">return</span> <span class="token keyword">this</span><span class="token punctuation">.</span>rule<span class="token punctuation">.</span><span class="token function">choose</span><span class="token punctuation">(</span>key<span class="token punctuation">)</span><span class="token punctuation">;</span>
            <span class="token punctuation">&#125;</span> <span class="token keyword">catch</span> <span class="token punctuation">(</span><span class="token class-name">Exception</span> var3<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
                logger<span class="token punctuation">.</span><span class="token function">warn</span><span class="token punctuation">(</span><span class="token string">"LoadBalancer [&#123;&#125;]:  Error choosing server for key &#123;&#125;"</span><span class="token punctuation">,</span> <span class="token keyword">new</span> <span class="token class-name">Object</span><span class="token punctuation">[</span><span class="token punctuation">]</span><span class="token punctuation">&#123;</span><span class="token keyword">this</span><span class="token punctuation">.</span>name<span class="token punctuation">,</span> key<span class="token punctuation">,</span> var3<span class="token punctuation">&#125;</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
                <span class="token keyword">return</span> <span class="token keyword">null</span><span class="token punctuation">;</span>
            <span class="token punctuation">&#125;</span>
        <span class="token punctuation">&#125;</span>
    <span class="token punctuation">&#125;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>

<p>这里又转交给了rule的choose方法。这里的rule是IRule接口，实现类有如下几个：</p>
<p><img src="https://p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/4cd44c14a29b4d59ac085814d7d36264~tplv-k3u1fbpfcp-zoom-1.image"></p>
<p>实际实现类是ZoneAvoidanceRule继承PredicateBasedRule</p>
<pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token keyword">public</span> <span class="token class-name">Server</span> <span class="token function">choose</span><span class="token punctuation">(</span><span class="token class-name">Object</span> key<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
        <span class="token class-name">ILoadBalancer</span> lb <span class="token operator">=</span> <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">getLoadBalancer</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token class-name">Optional</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">Server</span><span class="token punctuation">></span></span> server <span class="token operator">=</span> <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">getPredicate</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">chooseRoundRobinAfterFiltering</span><span class="token punctuation">(</span>lb<span class="token punctuation">.</span><span class="token function">getAllServers</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span> key<span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token keyword">return</span> server<span class="token punctuation">.</span><span class="token function">isPresent</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">?</span> <span class="token punctuation">(</span><span class="token class-name">Server</span><span class="token punctuation">)</span>server<span class="token punctuation">.</span><span class="token function">get</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">:</span> <span class="token keyword">null</span><span class="token punctuation">;</span>
    <span class="token punctuation">&#125;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span></span></code></pre>

<pre class="line-numbers language-none"><code class="language-none">public abstract AbstractServerPredicate getPredicate();<span aria-hidden="true" class="line-numbers-rows"><span></span></span></code></pre>

<p>交给了实现了chooseRoundRobinAfterFiltering抽象方法的AbstractServerPredicate,而具体实现方法为：</p>
<pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token keyword">private</span> <span class="token keyword">int</span> <span class="token function">incrementAndGetModulo</span><span class="token punctuation">(</span><span class="token keyword">int</span> modulo<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
        <span class="token keyword">int</span> current<span class="token punctuation">;</span>
        <span class="token keyword">int</span> next<span class="token punctuation">;</span>
        <span class="token keyword">do</span> <span class="token punctuation">&#123;</span>
            current <span class="token operator">=</span> <span class="token keyword">this</span><span class="token punctuation">.</span>nextIndex<span class="token punctuation">.</span><span class="token function">get</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
            next <span class="token operator">=</span> <span class="token punctuation">(</span>current <span class="token operator">+</span> <span class="token number">1</span><span class="token punctuation">)</span> <span class="token operator">%</span> modulo<span class="token punctuation">;</span>
        <span class="token punctuation">&#125;</span> <span class="token keyword">while</span><span class="token punctuation">(</span><span class="token operator">!</span><span class="token keyword">this</span><span class="token punctuation">.</span>nextIndex<span class="token punctuation">.</span><span class="token function">compareAndSet</span><span class="token punctuation">(</span>current<span class="token punctuation">,</span> next<span class="token punctuation">)</span> <span class="token operator">||</span> current <span class="token operator">>=</span> modulo<span class="token punctuation">)</span><span class="token punctuation">;</span>

        <span class="token keyword">return</span> current<span class="token punctuation">;</span>
    <span class="token punctuation">&#125;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>

<p>至此找到了一个轮询的Server，这是默认实现。</p>
<p>你觉得我还有机会吗？先理一下思路，有2个抽象点可以深入看下，一个是获取loadBalancer的时候，一个是loadBalancer的rule。</p>
<p>我们一个一个回溯再深入一下，首先我们还是要回答开头的一个问题</p>
<blockquote>
<p>首先我知道gateway一定会走LoadBalancerClientFilter，别问我怎么知道的，要问就是随便在spring-cloud-gateway-core的源码里根据类名猜的</p>
</blockquote>
<p>这么不负责任的回答，我现在再看都有点脸红，不瞒你了，直接上代码吧</p>
<p><img src="https://p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/ac5ed7b86cf34516ab1f8652c4295ea7~tplv-k3u1fbpfcp-zoom-1.image"> </p>
<p><img src="https://p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/f438637efe6944ceadcb923db9683a33~tplv-k3u1fbpfcp-zoom-1.image"></p>
<p>自动加载机制，初始化了LoadBalancerClientFilter,并且依赖RibbonAutoConfiguration.而LoadBalancerClientFilter初始化也需要2个参数：LoadBalancerClient和LoadBalancerProperties，我们看下RibbonAutoConfiguration：</p>
<p><img src="https://p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/c8e89937319842ca93630013e7487fdf~tplv-k3u1fbpfcp-zoom-1.image"></p>
<p>重点这两个Bean，至此LoadBalancerClientFilter初始化完毕，并加入gateway的Filter大军，执行</p>
<p>public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain)方法</p>
<p>现在回到之前留的一个疑问，<img src="https://p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/4c1cf636434742d8a30b5349c1c26bfe~tplv-k3u1fbpfcp-zoom-1.image"></p>
<p>这个loadBalancer其实就是LoadBalancerClient,注入的实现类就是RibbonLoadBalancerClient，而</p>
<p>@ConditionalOnMissingBean({LoadBalancerClient.class})</p>
<p>是有机会替换loadBalancer的。</p>
<p>那现在我们再看rule是怎么初始化的。</p>
<p><img src="https://p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/538f1e4af8274aa9a9f999d318d9997c~tplv-k3u1fbpfcp-zoom-1.image"></p>
<p><img src="https://p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/b4211aff4c664b6f9995a783f38ed21e~tplv-k3u1fbpfcp-zoom-1.image"></p>
<p>而RibbonLoadBalancerClient里面的ILoadBalancer也是可以配置的</p>
<p><img src="https://p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/d9bec45f59194aeebd55831b4697173a~tplv-k3u1fbpfcp-zoom-1.image"></p>
<p>通过在gateway里配置properties文件，即可指定自定义的ILoadBalancer和IRule</p>
<p>现在我们回顾一下调用流程，发现有2个丧心病狂的地方：</p>
<ol>
<li> LoadBalancerClientFilter</li>
</ol>
<pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token keyword">protected</span> <span class="token class-name">ServiceInstance</span> <span class="token function">choose</span><span class="token punctuation">(</span><span class="token class-name">ServerWebExchange</span> exchange<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
        <span class="token keyword">return</span> <span class="token keyword">this</span><span class="token punctuation">.</span>loadBalancer<span class="token punctuation">.</span><span class="token function">choose</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token punctuation">(</span>URI<span class="token punctuation">)</span>exchange<span class="token punctuation">.</span><span class="token function">getAttribute</span><span class="token punctuation">(</span><span class="token class-name">ServerWebExchangeUtils</span><span class="token punctuation">.</span>GATEWAY_REQUEST_URL_ATTR<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">getHost</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token punctuation">&#125;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span></span></code></pre>

<p>这里丢失了exchange,只有serviceId的信息即：</p>
<p>((URI)exchange.getAttribute(ServerWebExchangeUtils.GATEWAY_REQUEST_URL_ATTR)).getHost()</p>
<p>2.RibbonLoadBalancerClient</p>
<pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token keyword">public</span> <span class="token class-name">ServiceInstance</span> <span class="token function">choose</span><span class="token punctuation">(</span><span class="token class-name">String</span> serviceId<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
        <span class="token keyword">return</span> <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">choose</span><span class="token punctuation">(</span>serviceId<span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token class-name">Object</span><span class="token punctuation">)</span><span class="token keyword">null</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token punctuation">&#125;</span>
<span class="token keyword">public</span> <span class="token class-name">ServiceInstance</span> <span class="token function">choose</span><span class="token punctuation">(</span><span class="token class-name">String</span> serviceId<span class="token punctuation">,</span> <span class="token class-name">Object</span> hint<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
        <span class="token class-name">Server</span> server <span class="token operator">=</span> <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">getServer</span><span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">getLoadBalancer</span><span class="token punctuation">(</span>serviceId<span class="token punctuation">)</span><span class="token punctuation">,</span> hint<span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token keyword">return</span> server <span class="token operator">==</span> <span class="token keyword">null</span> <span class="token operator">?</span> <span class="token keyword">null</span> <span class="token operator">:</span> <span class="token keyword">new</span> <span class="token class-name">RibbonLoadBalancerClient<span class="token punctuation">.</span>RibbonServer</span><span class="token punctuation">(</span>serviceId<span class="token punctuation">,</span> server<span class="token punctuation">,</span> <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">isSecure</span><span class="token punctuation">(</span>server<span class="token punctuation">,</span> serviceId<span class="token punctuation">)</span><span class="token punctuation">,</span> <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">serverIntrospector</span><span class="token punctuation">(</span>serviceId<span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">getMetadata</span><span class="token punctuation">(</span>server<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token punctuation">&#125;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>

<p>这里直接传了个null</p>
<p>丢失了request的信息，又key默认值”default”</p>
<p>所以我们如果想要实现，必须重写LoadBalancerClientFilter的protected ServiceInstance choose(ServerWebExchange exchange)</p>
<p>而ILoadBalancer其实不需要自定义，只需要自定义IRule即可</p>
<p>代码如下：</p>
<pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token comment">/**
 * @author wangdengwu
 */</span>
<span class="token annotation punctuation">@Slf4j</span>
<span class="token keyword">public</span> <span class="token keyword">class</span> <span class="token class-name">SameIpBalanceRule</span> <span class="token keyword">extends</span> <span class="token class-name">ClientConfigEnabledRoundRobinRule</span> <span class="token punctuation">&#123;</span>

    <span class="token keyword">public</span> <span class="token class-name">SameIpBalanceRule</span><span class="token punctuation">(</span><span class="token class-name">ILoadBalancer</span> lb<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
        <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">setLoadBalancer</span><span class="token punctuation">(</span>lb<span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token punctuation">&#125;</span>

    <span class="token keyword">public</span> <span class="token class-name">SameIpBalanceRule</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>

    <span class="token punctuation">&#125;</span>

    <span class="token annotation punctuation">@Override</span>
    <span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">initWithNiwsConfig</span><span class="token punctuation">(</span><span class="token class-name">IClientConfig</span> iClientConfig<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>

    <span class="token punctuation">&#125;</span>

    <span class="token annotation punctuation">@Override</span>
    <span class="token keyword">public</span> <span class="token class-name">Server</span> <span class="token function">choose</span><span class="token punctuation">(</span><span class="token class-name">Object</span> ip<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
        log<span class="token punctuation">.</span><span class="token function">info</span><span class="token punctuation">(</span><span class="token string">"client ip:&#123;&#125;"</span><span class="token punctuation">,</span> ip<span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token class-name">List</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">Server</span><span class="token punctuation">></span></span> servers <span class="token operator">=</span> <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">getLoadBalancer</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">getReachableServers</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token keyword">if</span> <span class="token punctuation">(</span>servers<span class="token punctuation">.</span><span class="token function">isEmpty</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
            <span class="token keyword">return</span> <span class="token keyword">null</span><span class="token punctuation">;</span>
        <span class="token punctuation">&#125;</span>
        <span class="token keyword">if</span> <span class="token punctuation">(</span>servers<span class="token punctuation">.</span><span class="token function">size</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">==</span> <span class="token number">1</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
            <span class="token keyword">return</span> servers<span class="token punctuation">.</span><span class="token function">get</span><span class="token punctuation">(</span><span class="token number">0</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token punctuation">&#125;</span>
        <span class="token keyword">return</span> <span class="token function">sameIpChoose</span><span class="token punctuation">(</span>servers<span class="token punctuation">,</span> ip<span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token punctuation">&#125;</span>

    <span class="token keyword">private</span> <span class="token class-name">Server</span> <span class="token function">sameIpChoose</span><span class="token punctuation">(</span><span class="token class-name">List</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">Server</span><span class="token punctuation">></span></span> servers<span class="token punctuation">,</span> <span class="token class-name">Object</span> ip<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
        <span class="token keyword">for</span> <span class="token punctuation">(</span><span class="token keyword">int</span> i <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span> i <span class="token operator">&lt;</span> servers<span class="token punctuation">.</span><span class="token function">size</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span> i<span class="token operator">++</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
            <span class="token class-name">Server</span> server <span class="token operator">=</span> servers<span class="token punctuation">.</span><span class="token function">get</span><span class="token punctuation">(</span>i<span class="token punctuation">)</span><span class="token punctuation">;</span>
            <span class="token class-name">String</span> host <span class="token operator">=</span> server<span class="token punctuation">.</span><span class="token function">getHost</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
            <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token class-name">StringUtils</span><span class="token punctuation">.</span><span class="token function">equals</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token class-name">CharSequence</span><span class="token punctuation">)</span> ip<span class="token punctuation">,</span> host<span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
                <span class="token keyword">return</span> server<span class="token punctuation">;</span>
            <span class="token punctuation">&#125;</span>
        <span class="token punctuation">&#125;</span>
        <span class="token keyword">return</span> <span class="token keyword">super</span><span class="token punctuation">.</span><span class="token function">choose</span><span class="token punctuation">(</span>ip<span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token punctuation">&#125;</span>
<span class="token punctuation">&#125;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>

<pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token comment">/**
 * @author wangdengwu
 */</span>
<span class="token annotation punctuation">@Component</span>
<span class="token keyword">public</span> <span class="token keyword">class</span> <span class="token class-name">SameIpLoadBalancerClientFilter</span> <span class="token keyword">extends</span> <span class="token class-name">LoadBalancerClientFilter</span> <span class="token punctuation">&#123;</span>

    <span class="token annotation punctuation">@Value</span><span class="token punctuation">(</span><span class="token string">"$&#123;xxx.same.ip.enable&#125;"</span><span class="token punctuation">)</span>
    <span class="token keyword">private</span> <span class="token class-name">Boolean</span> enableSameIp <span class="token operator">=</span> <span class="token boolean">false</span><span class="token punctuation">;</span>

    <span class="token keyword">public</span> <span class="token class-name">SameIpLoadBalancerClientFilter</span><span class="token punctuation">(</span><span class="token class-name">LoadBalancerClient</span> loadBalancer<span class="token punctuation">,</span> <span class="token class-name">LoadBalancerProperties</span> properties<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
        <span class="token keyword">super</span><span class="token punctuation">(</span>loadBalancer<span class="token punctuation">,</span> properties<span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token punctuation">&#125;</span>

    <span class="token annotation punctuation">@Override</span>
    <span class="token keyword">protected</span> <span class="token class-name">ServiceInstance</span> <span class="token function">choose</span><span class="token punctuation">(</span><span class="token class-name">ServerWebExchange</span> exchange<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
        <span class="token comment">//是否开启same ip策略</span>
        <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token operator">!</span>enableSameIp<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
            <span class="token keyword">return</span> <span class="token keyword">super</span><span class="token punctuation">.</span><span class="token function">choose</span><span class="token punctuation">(</span>exchange<span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token punctuation">&#125;</span>
        <span class="token comment">//获取浏览器访问者IP</span>
        <span class="token class-name">String</span> ip <span class="token operator">=</span> <span class="token function">getRealIp</span><span class="token punctuation">(</span>exchange<span class="token punctuation">.</span><span class="token function">getRequest</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token class-name">String</span> serviceIp <span class="token operator">=</span> exchange<span class="token punctuation">.</span><span class="token function">getRequest</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">getHeaders</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">getFirst</span><span class="token punctuation">(</span><span class="token string">"serviceIp"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token comment">//强制指定IP优先级最高</span>
        <span class="token keyword">if</span> <span class="token punctuation">(</span>serviceIp <span class="token operator">!=</span> <span class="token keyword">null</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
            ip <span class="token operator">=</span> serviceIp<span class="token punctuation">;</span>
        <span class="token punctuation">&#125;</span>
        <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">.</span>loadBalancer <span class="token keyword">instanceof</span> <span class="token class-name">RibbonLoadBalancerClient</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
            <span class="token class-name">RibbonLoadBalancerClient</span> client <span class="token operator">=</span> <span class="token punctuation">(</span><span class="token class-name">RibbonLoadBalancerClient</span><span class="token punctuation">)</span> <span class="token keyword">this</span><span class="token punctuation">.</span>loadBalancer<span class="token punctuation">;</span>
            <span class="token class-name">String</span> serviceId <span class="token operator">=</span> <span class="token punctuation">(</span><span class="token punctuation">(</span>URI<span class="token punctuation">)</span> exchange<span class="token punctuation">.</span><span class="token function">getAttribute</span><span class="token punctuation">(</span>GATEWAY_REQUEST_URL_ATTR<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">getHost</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
            <span class="token comment">//这里使用ip做为选择服务实例的key</span>
            <span class="token keyword">return</span> client<span class="token punctuation">.</span><span class="token function">choose</span><span class="token punctuation">(</span>serviceId<span class="token punctuation">,</span> ip<span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token punctuation">&#125;</span>
        <span class="token keyword">return</span> <span class="token keyword">super</span><span class="token punctuation">.</span><span class="token function">choose</span><span class="token punctuation">(</span>exchange<span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token punctuation">&#125;</span>

    <span class="token keyword">private</span> <span class="token class-name">String</span> <span class="token function">getRealIp</span><span class="token punctuation">(</span><span class="token class-name">ServerHttpRequest</span> request<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
        <span class="token comment">// 这个一般是Nginx反向代理设置的参数</span>
        <span class="token class-name">String</span> ip <span class="token operator">=</span> request<span class="token punctuation">.</span><span class="token function">getHeaders</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">getFirst</span><span class="token punctuation">(</span><span class="token string">"X-Real-IP"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token keyword">if</span> <span class="token punctuation">(</span>ip <span class="token operator">==</span> <span class="token keyword">null</span> <span class="token operator">||</span> ip<span class="token punctuation">.</span><span class="token function">length</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">==</span> <span class="token number">0</span> <span class="token operator">||</span> <span class="token string">"unknown"</span><span class="token punctuation">.</span><span class="token function">equalsIgnoreCase</span><span class="token punctuation">(</span>ip<span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
            ip <span class="token operator">=</span> request<span class="token punctuation">.</span><span class="token function">getHeaders</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">getFirst</span><span class="token punctuation">(</span><span class="token string">"X-Forwarded-For"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token punctuation">&#125;</span>
        <span class="token keyword">if</span> <span class="token punctuation">(</span>ip <span class="token operator">==</span> <span class="token keyword">null</span> <span class="token operator">||</span> ip<span class="token punctuation">.</span><span class="token function">length</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">==</span> <span class="token number">0</span> <span class="token operator">||</span> <span class="token string">"unknown"</span><span class="token punctuation">.</span><span class="token function">equalsIgnoreCase</span><span class="token punctuation">(</span>ip<span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
            ip <span class="token operator">=</span> request<span class="token punctuation">.</span><span class="token function">getHeaders</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">getFirst</span><span class="token punctuation">(</span><span class="token string">"Proxy-Client-IP"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token punctuation">&#125;</span>
        <span class="token keyword">if</span> <span class="token punctuation">(</span>ip <span class="token operator">==</span> <span class="token keyword">null</span> <span class="token operator">||</span> ip<span class="token punctuation">.</span><span class="token function">length</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">==</span> <span class="token number">0</span> <span class="token operator">||</span> <span class="token string">"unknown"</span><span class="token punctuation">.</span><span class="token function">equalsIgnoreCase</span><span class="token punctuation">(</span>ip<span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
            ip <span class="token operator">=</span> request<span class="token punctuation">.</span><span class="token function">getHeaders</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">getFirst</span><span class="token punctuation">(</span><span class="token string">"WL-Proxy-Client-IP"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token punctuation">&#125;</span>
        <span class="token keyword">if</span> <span class="token punctuation">(</span>ip <span class="token operator">==</span> <span class="token keyword">null</span> <span class="token operator">||</span> ip<span class="token punctuation">.</span><span class="token function">length</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">==</span> <span class="token number">0</span> <span class="token operator">||</span> <span class="token string">"unknown"</span><span class="token punctuation">.</span><span class="token function">equalsIgnoreCase</span><span class="token punctuation">(</span>ip<span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
            ip <span class="token operator">=</span> request<span class="token punctuation">.</span><span class="token function">getRemoteAddress</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">getAddress</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">getHostAddress</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token punctuation">&#125;</span>
        <span class="token comment">// 处理多IP的情况（只取第一个IP）</span>
        <span class="token keyword">if</span> <span class="token punctuation">(</span>ip <span class="token operator">!=</span> <span class="token keyword">null</span> <span class="token operator">&amp;&amp;</span> ip<span class="token punctuation">.</span><span class="token function">contains</span><span class="token punctuation">(</span><span class="token string">","</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
            <span class="token class-name">String</span><span class="token punctuation">[</span><span class="token punctuation">]</span> ipArray <span class="token operator">=</span> ip<span class="token punctuation">.</span><span class="token function">split</span><span class="token punctuation">(</span><span class="token string">","</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
            ip <span class="token operator">=</span> ipArray<span class="token punctuation">[</span><span class="token number">0</span><span class="token punctuation">]</span><span class="token punctuation">;</span>
        <span class="token punctuation">&#125;</span>
        <span class="token keyword">return</span> ip<span class="token punctuation">;</span>
    <span class="token punctuation">&#125;</span>

<span class="token punctuation">&#125;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>

<p>至此，代码完成了需求。</p>
<p>这里只是gateway实现了自定义路由的功能，其实还有一个地方遗漏了，那就是服务之间使用@FeignClient调用的时候，这块如何实现同源IP功能，就留给你去思考了。</p>

                
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